This is an 1/8″ thick aluminum replacement for the factory instrument cluster that fits the factory 99-06 GM truck location and has mounts for the Holley EFI 12.3″ Pro Dash (part number 553-111). Easily painted, polished, or powdercoated to your liking if you want something other than the brushed aluminum look. This display is very large and may require trimming of the surrounding plastic to see all of the screen (the picture with the blue dash is with un-trimmed plastic). Photo with tape measure shows how much needs to be trimmed from the lower plastic so it does not contact the screen.